alleryBulbs rated 60 W and 40 W at 200 V are connected in series across 200 V. Assume constant resistance. Which bulb uses more power, and what is total power?
A40 W bulb; 24 W
B60 W bulb; 24 W
C40 W bulb; 100 W
D60 W bulb; 100 W
Answer & Solution
Correct answer: A. 40 W bulb; 24 W
Their resistances are 200²/60 and 200²/40 Ω, so the series power is 24 W and the higher-resistance 40 W bulb uses more.
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